I am trying to follow the formatting requirements for a specific conference which state that the document title must have 1.5 inch left and right margins while the rest of the paper must have 1 inch margins.

You could use an environment like quote which just changes the margin locally, but if it is just for the title in a specific document, if teh title is centred you don't need to do anything other than force line breaks with \\ if a line is too long
– David CarlisleAug 31 '13 at 22:11

The answer above assumed that the titling infomation should appear on a page of its own; after the edit to the original question it is clear that this is not the case; the titling information is produced using \maketitle and the document text should begin immediately afterwards.

In this case, the adjustwidth environment from the changepage package can be used; a patching of \@maketitle does the job: